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MapCache uses the concept of a “source” as a service that is able to return
image data given a set of parameters (namely an extent, an image size, and a
projection). Typically, a source is the third-party WMS server that you want
to put a tile cache in front of.

A WMS server is the main upstream server type used by MapCache. When processing a
given tile, if it is not found in its cache, MapCache will query a WMS server with
a GetMap request, split the returned image data into individual tiles, and store
those tiles in its cache for subsequent requests.

You should usually only supply vendor-specific parameters to the
<params> block. Never include any hardcoded BBOX, WIDTH, HEIGHT, SRS or
any parameters related to dimensions inside this block, as these are calculated
by MapCache itself at runtime.

MapCache WMTS source uses GDAL WMTS driver under the hood. Note that GDAL version must be > 2.1 to be able to enable the driver correctly. GDAL WMTS driver documentation can be found on: http://www.gdal.org/frmt_wmts.html